Cincinnati Sub-Zero ZP Series - Page 82

MAINTENANCE WITH Q & A
70
GENERAL TROUBLESHOOTING PROCEDURES
PROBLEM
PROBABLE CAUSE
CORRECTIVE ACTION
R-508B/R-23
head pressure
too low
Refrigerant shortage
Repair leak and recharge
R-404A head
pressure too
high
Condensing air too warm
Maximum condenser inlet air = 80°F
Restricted air cooled condenser
Clean condenser
Air in system
Recover, evacuate and recharge
R-404A head
pressure too
low
Condensing air too cold
Location may need to be changed
Low refrigerant charge
Repair leak & recharge
Noisy unit
Insufficient compressor oil
Consult Cincinnati Sub Zero
Fan
Check blades
Tubing rattle
Bend tubes away from contact
Compressor mounting loose
Tighten
Table 5-4: General Troubleshooting Procedures (Continued)
HUMIDITY TROUBLESHOOTING PROCEDURES (OPTIONAL ATOMIZER)
PROBLEM
PROBABLE CAUSE
CORRECTIVE ACTION
Humidity NOT
reaching desired
level
*Applies only to
units with an
atomizing
humidity system.
Heater failure
Check heater and replace as required
*Atomizing nozzle clogged
Remove and clean. Replace demineralizer
filter if necessary
Air pump not functioning
Check air pump
*Filter/Strainer Clogged
Remove and clean
Water is not connected to unit
Connect water
Water control solenoid not energized
Check coil - replace if burned
Dispersion tube is clogged
Remove and clean
Chamber fan not functioning
Check fan circuit check fan blade for
tightness on shaft
Humidity switch not on
Turn switch on
Demineralizer cartridge clogged internally
Replace cartridge
Solid state sensor defective
Replace sensor unit
*Water metering valve not adjusting
properly
Adjust to 20.25 cubic centimeters
Circuit breaker tripped
Reset breaker
Defective heating element
Replace element
Defective float switch
Replace float unit
Dirty humidity sensor
See corresponding manufacturers manual
in the Accessories folder for information
Table 5-5: Humidity System Troubleshooting Procedures